Recent questions tagged C++

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c++ - Templates and nested classes/structures

I have a simple container : template <class nodeType> list { public: struct node { nodeType info; node* ... Any help is sincerely appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why do functions using std::mutex make a null check of the address of pthread_key_create?

Take this simple function that increments an integer under a lock implemented by std::mutex: #include <mutex ... documentation on this behavior. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Undefined behaviour with const_cast

I was hoping that someone could clarify exactly what is meant by undefined behaviour in C++. Given the following class ... ? NB: I use MSVC2008. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Differing return type for virtual functions

A virtual function's return type should be the same type that is in base class, or covariant. But why do we have this restriction? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to set bits of a bit vector efficiently in parallel?

Consider a bit vector of N bits in it (N is large) and an array of M numbers (M is moderate, usually much ... desired, if any benefit from it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Using pthread.h on a windows build

I have a codebase that makes extensive use of pthread.h. On a windows visual studio project, this obviously doesn ... calls. This is my question See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Assignment operator and copy constructor in the presence of references

I am just experimenting with the references using this code: class A { }; class B { public: B(A& a): ... when the other could not be generated? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can GCC produce struct/class name mismatches like VS?

I would like to get GCC to produce a warning that VisualStudio produces when it finds a name that has been ... don't suddenly stop working. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - virtual desctructor on pure abstract base class

I have struct IMyInterface { virtual method1() = 0; virtual method2() = 0; }; GCC insists that I have struct ... insist on it and if so why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Installation of R-package "BH" not possible

I cannot install the R-package BH which I need only to install dplyr afterwards. The download works ... grDevices utils datasets methods base See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Access to protected constructor of base class

A derived class can call a protected base class constructor in its ctor-initializer, but only for its ... base class constructors described? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why there is no concept of "const-correctness" for class's static member functions?

Use case: class A { static int s_common; public: static int getCommon () const { s_common; }; }; Typically ... ; any logical reason behind it ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - std::string — small string optimization and swap

From N3290, [container.requirements.general]: The expression a.swap(b), for containers a and b of a standard ... to add std::string too? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - class (or struct) self-reference by template

Is the following legal? template< typename T > struct tree_node { T t; std::vector<tree_node> children; }; A ... T t; tree_node * children; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is it possible to determine how much space is available on the stack?

I'm architecting a small software engine and I'd like to make expensive use of the stack for rapid iterations of ... come up on any platform. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can I get the Owning Object of a Member Function Template Parameter?

Given a object: struct foo { void func(); }; Now given the templatized function declaration: template<typename T, T F ... be a way to write it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Are there any guarantees for unions that contain a wrapped type and the type itself?

Can I put a T and a wrapped T in an union and inspect them as I like? union Example { T value; ... well-defined on common initial sequences. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How can I have non-static thread-local variable for each instance

The problem itself: class B{/*...*/}; class A { /* members */ NON-static thread_local B var; // ... idea that really works. Any suggestion? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - QListWidget : Event on item click

Basically, what I have is the following : A QListWidget, with some items in it like this : ListMail is my QListWidget ... .. Any help ? Thanks ! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Obtaining current ModelView matrix

In OpenGL, how do I read the current x/y translation in the modelview matrix? I know that you have to load the ... know precisely how to do it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - openmp conditional parallel loop

I am trying to use an openmp for loop if a certain condition holds. I could simply use an if else statement ... code inside the for loop twice. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Initialization list bug in gcc?

Consider the following code, where B is a virtual base class inherited by D through B1 and B2: #include < ... fundamentally messed up in gcc!? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ typedef another class's enum?

So here's my problem: struct A { enum A_enum { E0, E1, E2 }; }; struct B { typedef A::A_enum B_enum; ... a good way to do something like this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - parent_path() with or without trailing slash

As explained in the documentation, the expected output of the following is: boost::filesystem::path filePath1 = ... this within the framework? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to deploy Qt applications for Linux

I followed all the steps successfully as mention in the Qt documentation: Qt for Linux/X11 - Building from Source ... other system. Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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388 views

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c++ - converting an array of null terminated const char* strings to a std::vector< std::string >

I have a Visual Studio 2008 C++ function where I'm given an array of null-terminated strings const char* and a ... Boost is fine, STL is fine. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - how to get Heap size of a program

How to find heap memory size of a c++ program under linux platform ?I need heap memory space before the usage of ... usage of new return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Portable way to determine the platform's line separator

Different platforms use different line separator schemes (LF, CR-LF, CR, NEL, Unicode LINE SEPARATOR, etc.). ... information in some other way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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